A compound wound motor has both a series and a shunt field winding, i. What are the best ways to control the speed of dc motor. However it is not having a disadvantages of series motor even at light or no load. Mar 23, 2019 a series wound dc motor like in the case of shunt wound dc motor or compound wound dc motor falls under the category of selfexcited dc motors, and it gets its name from the fact that the field winding in this case is connected internally in series to the armature. If a sudden heavy load is thrown on the motor, the series field winding will draw a heavy current from the supply and thus cause the total flux to reduce to a very small value. In the differential compound motor, the flux from the series winding. Why differentialy compounded dc motors are not used in. Basics of dc motors for electrical engineers beginners on photo. Volume 2 of 4 module 3 dc circuits this module introduces the rules associated with the reactive components of inductance and capacitance and how they affect dc circuits. In fact, the same dc machine can be used interchangeably as a generator or as a motor. The basic principle of a dc motor is the creation of a rotating magnet inside the mobile part of the motor, the rotor. The brush dc motor is driven by directly applying a voltage to the. A winding is connected in series with the armature as in a series dc.
State the term that applies to voltage variation from noload to fullload conditions and how it is expressed as a percentage. Before taking about types of wound motor you can refresh and revise previous articles as working. Series wound dc motor construction, principle, speed and torque. Overview the acdc motor theory course was specifically developed for electricians and electronic technicians as well as for the multicraft training needs of process and manufacturing facilities. Objective identify the components of an ac motor and explain their function. This article describes the construction of dc motor.
Pdf on may 3, 2019, ahmed m t ibraheem alnaib and others published dc motors find, read and cite all the research you need on researchgate. A good material for the poles of a pmdc motor should have the apposite of the above. The speed control mechanism is applicable in many cases like controlling the movement of robotic vehicles, movement of motors in paper mills and the movement of motors in elevators where different types of dc motors are used. Pdf on may 3, 2019, ahmed m t ibraheem alnaib and others published dc motors find, read and cite all. Because the magnetic field rotates in this way, an ac motor does not need power or mechanical aid to be applied to the rotor. A compound wound dc motor also known as a dc compound motor is a type of selfexcited motor, and is made up of both series the field coils s1 s2 and shunt field coils f1 f2 connected to the armature winding as shown in the figure below. Pdf dc motors have been used in the past as the workhorse of industrial.
Changing either field or armature winding leads, changes direction of current and hence direction of rotation. To obtain the performance characteristics of a dc shunt motor by load test. Electrical machinel dc laboratory manual grietelectrical and. This course consists of 11 interactive, online lessons that address ac and dc motor theory. An introduction to electric motors stmicroelectronics. The working principle of a dc machine is when electric current flows through a coil within a magnetic field, and then the magnetic force generates a torque which rotates the dc motor.
To expose the students to the operation of dc generator. Home download center electrical engineering books and technical guides siemens basics of energy and automation guides basics of dc drives controlling a dc motor a thyristor bridge is a technique commonly used to control the speed of a dc motor by varying the dc voltage. Dc compound motor dc compound motor or compound wound dc motor is also a selfexcited motor, but it is a compound of both series and shunt field coils connected to the armature winding, a series field winding connected in series with the armature and a shunt field winding connected in parallel to the armature. By the way, in normal case only dc series motor or any other traction motor requires direction change. Flux produced by the shunt field per pole i a armature current the torque developed in the motor is opposed by the torques due to a friction and windage b eddy currents and hysteresis and c mechanical load connected at the shaft. A compound dc motor connects the armature and fields windings in a shunt and a series combination to give it characteristics of both a shunt and a series dc motor. How can the direction, or rotation, of a dc compound motor be. Start the motor by using 3point starter and adjust the speed of the motor in the rated value by using rheostat of motor 4.
The shunt field winding produces the definite flux and series flux helps the shunt field flux to increase the total flux level. In electrical terms, parallel is generally denoted as shunt. That is the reason behind naming it a dc shunt motor. Brushed dc motor theory and operation chris joyce, shane skikne, evan simpson, james nee january 8, 2014 abstract this study looked into the e ect of changing the material within the rotor of an electric motor. Its operation is based on the principle that when a current carrying conductor is placed in a. Prior to teslas inventions, direct current motors were the presiding type of motor. There is no difference in the construction of dc motor and generator. Make sure that no load is applied on the motors and the motor field rheostat should be in minimum position. When the shunt field winding is connected acro ss the load, it is called a longshunt. Series wound dc motor or dc series motor electrical4u. A compound wound dc motor also known as a dc compound. There is no basic difference in the construction of a dc generator and a dc motor.
Selfexcited dc motor is further divided into shunt wound, and series wound motor. The principal advantage of a dc motor over ac motor is that its speed can be changed over a wide range by a variety of simple methods. In a brushed dc motor, the coils on the rotor utilize the motors magnetic eld to create torque on the axle. Dc compound motor presentation topic group member sahib ullah bee f14 207 zain. Layout introduction circuit diagram working speed control methodology. Like generators, there are different types of dc motors which are also classified into shuntwound, serieswound and compound wound dc motors.
Compound wound dc motor or dc compound motor electrical4u. The dc machines are classified into two types such as dc generator as well as dc motor. As the name implies selfexcited, hence, in this type of motor, the current in the windings is supplied by the machine or motor itself. Pdf new life for old compound dc motors in industrial applications. A dc machine is an electromechanical energy alteration device. The working of dc motor is based on the principle that when a current carrying conductor is placed in a magnetic field, it experiences a mechanical force.
Construction and principle of operation of the shunt dc motor. Electrical machines laboratory roever college of engineering and. A dc motor is an electrical machine that converts electrical energy into mechanical energy. Jul 04, 20 torque and speed equation of dc shunt motor. In the cumulative compound motor, the field produced by the series winding. This motor is used when both a high starting torque and good speed regulation is needed. For each of them, there are different methods of speed control.
Pdf dc motor dc motor theory cahtayu cahtayu academia. Explain the effect of motor reaction in a dc generator. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three.
Basics of dc motors for electrical engineers beginners. Types of electric motors electric motors dc motors other motors h ac motors s unt motor separately excited induction motor stepper motor motor brushlessdc motor series motor hysteresis motor permanent magnet dc pmdc synchronous motor reluctance motor compounded motor universal motor. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion. Mar 23, 2019 a compound wound dc motor also known as a dc compound motor is a type of selfexcited motor, and is made up of both series the field coils s 1 s 2 and shunt field coils f 1 f 2 connected to the armature winding as shown in the figure below. Speed control of dc motor is achieved using different methods. Series wound dc motor as we said before that this type of dc motor is a selfexcited dc motor which converts electrical power into mechanical power based on electromechanical law, but in this motor, the field winding is connected in series to the armature winding. Dc compound motor is essentially a combination of series dc motor and shunt dc motor. The dc shuntwound motor, running on direct current, has its field windings placed in parallel to the armature. A particular configuration, the compound dc motor was widely used, for.
Download as docx, pdf, txt or read online from scribd. Each type has unique operating characteristics and applications. This is a direct method of testing a dc compound motor as a cumulative. An ac motor works by applying alternating current to stator windings, which produce a rotating magnetic field. Module 2 basic dc theory this module describes the basic concepts of direct current dc electrical circuits and discusses the associated terminology. Dc compound motor definition, types, applications, equations. Brake test on dc compound motor electric motor electrical. Many dc motors use an electromagnet for the stator, as illustrated in figure 27. Working principle of a dc motor an electric motor is an electrical machine which converts electrical energy into mechanical energy. Dc power input is converted into mechanical power at the shaft motor. Brake test on dc compound motor free download as word doc.
Dc motor theory mem 639 realtime microcomputer control 1. Dc compound motor or compound wound dc motor is also a selfexcited motor, but it is a compound of both series and shunt field coils connected to the armature winding, a series field winding connected in series with the armature and a shunt field winding connected in parallel to the armature. Same voltage is applied to both shunt winding and armature in this motor. Cumulative compound motor is capable of developing large amount of torque at low speeds just like series motor.
Jul 05, 2018 dc motor is an electromagnetic device which converts electrical energy into mechanical energy. Speed control of dc motor shunt, series and compound. Previously, you saw that a dc motor is made up basically of a fixed magnet stator and a rotating magnet rotor. The same dc machine can be used as a motor or generator. This paper describes a possibility to increase the operation range of. Dc motor dc motor theory the dc motor has two basic parts. Differential compound dc motors are having some disadvantages.